Quote Originally Posted by Ole View Post
No Ian, the film emulsion will be 0.3mm farther back than the plate emulsion when using film sheath inserts.

The adapter is there to hold the film flat and in place, but the folded-over edges mean that the emulsion is offset by 0.3mm.
The film sheaths I have let the film rest on the guides in the holders, and the folded-over edges stays free, so there's no offset. Film sheaths were probably manufactured to fit certain holders.